xiao/commands/edit-image/subtitle.js

const Command = require('../../framework/Command');
const { PermissionFlagsBits } = require('discord.js');
const { createCanvas, loadImage } = require('@napi-rs/canvas');
const request = require('node-superfetch');
const { wrapText } = require('../../util/Canvas');

module.exports = class SubtitleCommand extends Command {
	constructor(client) {
		super(client, {
			name: 'subtitle',
			aliases: ['closed-caption', 'closed-captions', 'cc', 'st'],
			group: 'edit-image',
			description: 'Adds subtitles to an image.',
			throttling: {
				usages: 2,
				duration: 10
			},
			clientPermissions: [PermissionFlagsBits.AttachFiles],
			credit: [
				{
					name: 'Google',
					url: 'https://www.google.com/',
					reason: 'Noto Font',
					reasonURL: 'https://www.google.com/get/noto/'
				}
			],
			args: [
				{
					key: 'text',
					type: 'string',
					max: 200
				},
				{
					key: 'image',
					type: 'image-or-avatar',
					avatarSize: 512,
					default: msg => msg.author.displayAvatarURL({ extension: 'png', size: 512, forceStatic: true })
				}
			]
		});
	}

	async run(msg, { text, image }) {
		const { body } = await request.get(image);
		const base = await loadImage(body);
		const canvas = createCanvas(base.width, base.height);
		const ctx = canvas.getContext('2d');
		ctx.drawImage(base, 0, 0);
		const fontSize = Math.round(base.height / 15);
		ctx.font = this.client.fonts.get('Noto-Regular.ttf').toCanvasString(fontSize);
		ctx.fillStyle = 'yellow';
		ctx.textAlign = 'center';
		const lines = wrapText(ctx, text, base.width - 10);
		if (!lines) return msg.reply('There\'s not enough width to subtitle this image.');
		ctx.textBaseline = 'bottom';
		const initial = base.height - ((lines.length - 1) * fontSize) - (fontSize / 2) - ((lines.length - 1) * 10);
		for (let i = 0; i < lines.length; i++) {
			const textHeight = initial + (i * fontSize) + (i * 10);
			ctx.strokeStyle = 'black';
			const rounded = Math.round(base.height / 100);
			ctx.lineWidth = rounded < 1 ? 1 : rounded;
			ctx.strokeText(lines[i], base.width / 2, textHeight);
			ctx.fillStyle = 'yellow';
			ctx.fillText(lines[i], base.width / 2, textHeight);
		}
		const attachment = canvas.toBuffer('image/png');
		if (Buffer.byteLength(attachment) > 2.5e+7) return msg.reply('Resulting image was above 25 MB.');
		return msg.say({ files: [{ attachment, name: 'subtitle.png' }] });
	}
};